William b



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UNITED STATES WILLIAM E. GWYER,

PATENT OFFICEo OF NEW YORK, N. Y.

' SPECIFICATION forming part of Letters Patent No. 238,894, dated March 15, 1881.

Application iiledJanuary 15,1881. (Nomodel.)-

To all whom it may concern Be it known that I, WILLIAM E. GWYER, of the city, county, and State of New York, have 4invented a new and useful Improvement in Governors forVulcanizingApparatus, ofwhich the following is a full, clear, and exact description.

With vulcanzers in which the required temperature is obtained by confining the steam, especially those used by dentists, the proper regulation oi' the temperature is of the utmost importance, and has heretofore been attended with ditculty. The usual method is to regulate the ow ot' gas to the steam-generator by hand; but such method is unreliable. Y

My invention has for its object the automatic regulation ot the iiow ot gas by a governor worked b y the steam-pressure, whereby the pressure, and consequently the temperature, is maintained at a nearly uniform point; and to this end my invention consists in a gas-cock opened by a spring and closed by steam-pressure, for regulation. ot' the tlow of gas, as hereinafter explained.

In the accompanying drawing my invention is illustrated by a sectional elevation ot' the governor.

A is a hollow screw-plug adapted for connection, by a pipe or otherwise, with the shell of the steam-box ot' the vulcanizer, which may be ot' any usual construction, as illustrated by the dotted lines.

B is a Burden spring, the same being a flat tube bent in C form, having its outer end closed, and attached, by the other end, to the plug A, by which the spring is sustained.

D is the gas-supply pipe, shown as passing through plug A, and iitted with a cock or valve, E, between the source ot' gas-supply and the burners. structed to cut oft' and open the gas-pipe by a limited extent ot' movement. For this purpose the valve-case a separates the gas-pipe., and the separated ends connect with passages b b that extend to the face of the valve-seat.

The valve cis a disk on the end of stem d, which carries a spiral spring, e, tending to retain the valve oi' from its seat,"and thus allow communication between the passages I.

The valve shown is con- On the outer end ot valve-stem d a rod, f, is connected by a swivel-joint, and this rod j' is connected, bya turn-buckle, g, with the free end ot' the spring B. The turn-buckle allows adjustment ot' the valve, so that it shall beretained normally open by the spring o, and until the expansionvot' spring B by the steampressure passes a given point.

In operation, the curve ot' the hollow C- spring B is enlarged in proportion to increase the steam-pressu re, and when the pressure passes beyond the point at which the governor is set the valve-stem is raised andthe flow of gas through valve E thereby checked until, by reduction ot' heat, the 'steam-pressnre is reduced, when the spring B reacts and .opens the valve.

This governor, being operated by the pressure, acts instantly', and forthat reason is more prompt and reliable than governors dependent for movement on expansion and cont-raction by changes ot temperature.

l do not limit myself' to thepressure-spring shown for obtaining movement ot' the valve by variations in steaIn-I'Jressure, as an ordinary diaphragm might be used with the springacted gas-cock.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. In governors for vulcanizers, the combination ot' a spring-opened gas cock or valve and a spring fitted for movement, by the pressure in the steam-box, to close the cock, substan: tially as shown and described.

2. The governor for vulcnnizers, consisting of the hollow C-sprin g B, valve E, turn-buckle connections g, gas-pipe l), and hollow screwplug A, substantially as shown and described, combined for operation, as set forth.

3. The combination, with the gassupply pipe ot' vulcanizing apparatus, of a cock or valve, E, titted for being closed by connections actuated directly by the pressure in the steambox, substantially as shown and described.

WILLIAM E. GWYER.

Witnesses:

Gno. D. WALKER. C. SEDGWICK. 

